Journal article
Submarine Groundwater Discharge‐Derived Carbon Fluxes in Mangroves: An Important Component of Blue Carbon Budgets?
Journal of Geophysical Research: Oceans, Vol.123(9), pp.6962-6979
09/2018
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Source: InCites
Abstract
Mangroves are blue carbon systems characterized by high soil carbon storage and sequestration. Soil carbon losses via groundwater or pore water pathways are potentially important yet poorly understood components of mangrove carbon budgets. Here we quantified submarine groundwater discharge (SGD) and associated dissolved inorganic carbon (DIC) and organic carbon (DOC) fluxes into a mangrove-dominated tropical bay (Maowei Sea) using a radon (222Rn) mass balance model. The SGD fluxes in Maowei Sea were estimated to be 4.9 × 107 (0.36 ± 0.33 m/day) and 2.6 × 107 m3/day (0.20 ± 0.18 m/day) for the wet and dry seasons, respectively, implying that SGD may respond to precipitation. The SGD-derived DIC and DOC fluxes (mol·m−2·day−1) in the wet season (DIC: 0.70 ± 0.82; DOC: 0.31 ± 0.30) were higher than those in the dry season (DIC: 0.25 ± 0.24; DOC: 0.25 ± 0.23). These SGD-derived carbon fluxes exceed local river inputs and constituted >70% of the total DIC and DOC input into the bay. If scaled up to the global weighted mangrove area in combination with data from other 32 study sites, carbon fluxes via SGD into mangroves may be equivalent to 29–48% of the global riverine input into the ocean. Therefore, we suggest that SGD is a major component of coastal carbon budgets and that accounting for SGD helps to reduce uncertainties in mangrove blue carbon budgets.
Details
- Title
- Submarine Groundwater Discharge‐Derived Carbon Fluxes in Mangroves: An Important Component of Blue Carbon Budgets?
- Creators
- Xiaogang Chen - East China Normal UniversityFenfen Zhang - East China Normal UniversityYanling Lao - Qinzhou UniversityXilong Wang - Qinzhou UniversityJinzhou Du - East China Normal UniversityIsaac R Santos - Southern Cross University
- Publication Details
- Journal of Geophysical Research: Oceans, Vol.123(9), pp.6962-6979
- Publisher
- Wiley-Blackwell Publishing, Inc.
- Number of pages
- 18
- Grant note
- Natural Science Foundation of China. Grant Number: 41576083 Key Research and Development Program of Guangxi, China. Grant Number: 2017AB43024 SKLEC Open Research Fund. Grant Number: SKLEC-KF201806
- Identifiers
- 991012926961802368
- Copyright
- © 2018. American Geophysical Union. All Rights Reserved.
- Academic Unit
- Faculty of Science and Engineering; Science; National Marine Science Centre
- Language
- English
- Resource Type
- Journal article